On 22.11.22 16:05, Muhammad Usama Anjum wrote:
On 11/22/22 7:49 PM, David Hildenbrand wrote:
On 22.11.22 15:00, Muhammad Usama Anjum wrote:
Hello,
I'm getting segmentation fault when mprotect file sub-tests in soft-dirty
kselftest are run on top next-20221122 and on v6.0. These sub-tests were
added by Peter recently. Has someone noticed this already?
On 6.0.7-200.fc36.x86_64, all tests pass.
# ./soft-dirty
TAP version 13
1..15
ok 1 Test test_simple
ok 2 Test test_vma_reuse dirty bit of allocated page
ok 3 Test test_vma_reuse dirty bit of reused address page
ok 4 Test test_hugepage huge page allocation
ok 5 Test test_hugepage huge page dirty bit
ok 6 Test test_mprotect-anon dirty bit of new written page
ok 7 Test test_mprotect-anon soft-dirty clear after clear_refs
ok 8 Test test_mprotect-anon soft-dirty clear after marking RO
ok 9 Test test_mprotect-anon soft-dirty clear after marking RW
ok 10 Test test_mprotect-anon soft-dirty after rewritten
ok 11 Test test_mprotect-file dirty bit of new written page
ok 12 Test test_mprotect-file soft-dirty clear after clear_refs
ok 13 Test test_mprotect-file soft-dirty clear after marking RO
ok 14 Test test_mprotect-file soft-dirty clear after marking RW
ok 15 Test test_mprotect-file soft-dirty after rewritten
# Totals: pass:15 fail:0 xfail:0 xpass:0 skip:0 error:0
Same on a kernel close to mm-unstable on top of 6.1.0-rc4:
# ./soft-dirty
TAP version 13
1..15
ok 1 Test test_simple
ok 2 Test test_vma_reuse dirty bit of allocated page
ok 3 Test test_vma_reuse dirty bit of reused address page
ok 4 Test test_hugepage huge page allocation
ok 5 Test test_hugepage huge page dirty bit
ok 6 Test test_mprotect-anon dirty bit of new written page
ok 7 Test test_mprotect-anon soft-dirty clear after clear_refs
ok 8 Test test_mprotect-anon soft-dirty clear after marking RO
ok 9 Test test_mprotect-anon soft-dirty clear after marking RW
ok 10 Test test_mprotect-anon soft-dirty after rewritten
ok 11 Test test_mprotect-file dirty bit of new written page
ok 12 Test test_mprotect-file soft-dirty clear after clear_refs
ok 13 Test test_mprotect-file soft-dirty clear after marking RO
ok 14 Test test_mprotect-file soft-dirty clear after marking RW
ok 15 Test test_mprotect-file soft-dirty after rewritten
# Totals: pass:15 fail:0 xfail:0 xpass:0 skip:0 error:0
Different architecture? Maybe recompile the tests?I get the segmentation on "Linux (none) 6.1.0-rc6-next-20221122 #36 SMP
PREEMPT_DYNAMIC Tue Nov 22 20:02:02 PKT 2022 x86_64":
soft-dirty[237]: segfault at ffffffffffffffff ip 0000000000401dff sp
00007ffc4ae08ee0 error 7 in soft-dirty[401000+2000] likely on CPU 0 (core
0, socket 0)
[ 348.579595] Code: bf 00 00 00 00 e8 e1 f2 ff ff 48 89 45 f0 48 83 7d f0
00 75 11 48 8d 3d 5f 14 00 00 b8 00 00 00 00 e8 75 f9 ff ff 48 8b 45 f0
<c6> 00 01 48 8b 55 f0 8b 45 cc 48 89 d6 89 c7 e8 50 05 00 00
8root@(none):/home/usama/repos/kernel/linux_mainline/tools/testing/selftests/vm#
[ 353.015360] soft-dirty[238]: segfault at ffffffffffffffff ip
0000000000401dff sp 00007ffc8ec97f80 error 7 in soft-dirty[401000+2000]
likely on CPU 0 (core 0, socket 0)
[ 353.016456] Code: bf 00 00 00 00 e8 e1 f2 ff ff 48 89 45 f0 48 83 7d f0
00 75 11 48 8d 3d 5f 14 00 00 b8 00 00 00 00 e8 75 f9 ff ff 48 8b 45 f0
<c6> 00 01 48 8b 55 f0 8b 45 cc 48 89 d6 89 c7 e8 50 05 00 00 84 c0
The config is attached. This is a minimal config. The kernel is run inside
a qemu instance with help of virtme scripts.
99.9% your config (+BTRFS, -debug symbols)
[root@vm-0 vm]# uname -a
Linux vm-0 6.1.0-rc6-next-20221122 #4 SMP PREEMPT_DYNAMIC Tue Nov 22
15:37:42 UTC 2022 x86_64 x86_64 x8x
[root@vm-0 vm]# ./soft-dirty
TAP version 13
1..15
ok 1 Test test_simple
ok 2 Test test_vma_reuse dirty bit of allocated page
ok 3 Test test_vma_reuse dirty bit of reused address page
ok 4 Test test_hugepage huge page allocation
ok 5 Test test_hugepage huge page dirty bit
ok 6 Test test_mprotect-anon dirty bit of new written page
ok 7 Test test_mprotect-anon soft-dirty clear after clear_refs
ok 8 Test test_mprotect-anon soft-dirty clear after marking RO
ok 9 Test test_mprotect-anon soft-dirty clear after marking RW
ok 10 Test test_mprotect-anon soft-dirty after rewritten
ok 11 Test test_mprotect-file dirty bit of new written page
ok 12 Test test_mprotect-file soft-dirty clear after clear_refs
ok 13 Test test_mprotect-file soft-dirty clear after marking RO
ok 14 Test test_mprotect-file soft-dirty clear after marking RW
ok 15 Test test_mprotect-file soft-dirty after rewritten
# Totals: pass:15 fail:0 xfail:0 xpass:0 skip:0 error:0
Are you maybe compiling the tests on the host or the guest does not have
sufficient vCPU features (e.g., "-cpu host" on the kernel cmdline)?
--
Thanks,
David / dhildenb
